发布于 2016-10-03 06:08:23 | 130 次阅读 | 评论: 0 | 来源: 网友投递
这里有新鲜出炉的Javascript教程,程序狗速度看过来!
JavaScript客户端脚本语言
Javascript 是一种由Netscape的LiveScript发展而来的原型化继承的基于对象的动态类型的区分大小写的客户端脚本语言,主要目的是为了解决服务器端语言,比如Perl,遗留的速度问题,为客户提供更流畅的浏览效果。
function createXMLDOM(){
var arrSignatures=["MSXML2.DOMDocument.5.0","MSXML2.DOMDocument.4.0","MSXML2.DOMDocument.3.0","MSXML2.DOMDocument","Microsoft.XmlDom"];
for(var i=0;i<arrSignatures.length;i++){
try{
var oXmlDom=new ActiveXObject(arrSignatures[i]);
return oXmlDom;
} catch(oError){
}
}
throw new Error("MSXML is not installed on your system");
}
var oXmlDom=createXMLDOM();
//方式一:加载字符串
oXmlDom.loadXML("<root><child/></rot>");
//处理错误
if(oXmlDom.parseError != 0){
var oError=oXmlDom.parseError;
alert("An Error occurred:\nError Code:" + oError.errorCode
+ "\nLine:" + oError.line + "\nLine Pos:" + oError.linepos
+ "\nReason:" + oError.reason);
} else {
var childNodes=oXmlDom.documentElement.childNodes;
console.log(childNodes.length+" "+childNodes[0].xml);// 1 <child/>
}
//方式二:加载XML文件
oXmlDom.onreadystatechange = function(){
//文档加载完毕
if(oXmlDom.readyState == 4){
if(oXmlDom.parseError != 0){
var oError=oXmlDom.parseError;
alert("An Error occurred:\nError Code:" + oError.errorCode
+ "\nLine:" + oError.line + "\nLine Pos:" + oError.linepos
+ "\nReason:" + oError.reason);
} else {
var childNodes=oXmlDom.documentElement.childNodes;
console.log(childNodes.length+" "+childNodes[0].xml);// 1 <child/>
}
}
}
oXmlDom.load("test.xml");
var oParser = new DOMParser();
var oXmlDom = oParser.parseFromString("<root/>","text/xml");
var oSerializer = new XMLSerializer();
var sXml = oSerializer.serializeToString(oXmlDom,"text/xml"); 在后面的例子中我们可以看到如何用defineGetter()方法来定义一个xml特性。
var reError = />([\s\S]*?)Location:([\s\S]*?)Line Number (\d+),Column (\d+):<sourcetext>([\s\S]*?)(?:\-*\^)/;
if(oXmlDom.documentElement.tagName == "parsererror"){
reError.test(oXmlDom.xml);
alert("An error occurred:\nDescription: " + RegExp.$1 +"\n"
+ "File: " + RegExp.$2 + "\n"
+ "Line: " + RegExp.$3 + "\n"
+ "Line Pos: " + RegExp.$4 + "\n"
+ "Source: " + RegExp.$5);
}
var oXmlDom=document.implementation.createDocument("","<root>",null);
oXmlDom.async = false;
oXmlDom.onload = function(){
alert('Done');
}
var reError = />([\s\S]*?)Location:([\s\S]*?)Line Number (\d+),Column (\d+):<sourcetext>([\s\S]*?)(?:\-*\^)/;
if(oXmlDom.documentElement.tagName == "parsererror"){
reError.test(oXmlDom.xml);
alert("An error occurred:\nDescription: " + RegExp.$1 +"\n"
+ "File: " + RegExp.$2 + "\n"
+ "Line: " + RegExp.$3 + "\n"
+ "Line Pos: " + RegExp.$4 + "\n"
+ "Source: " + RegExp.$5);
}
Node.prototype.__defineGetter__("xml", function () {
var oSerializer = new XMLSerializer();
return oSerializer.serializeToString(this, "text/xml");
});
oXmlDom.load('test.xml');
alert(oXmldom.xml);
var oNode = oXmlDom.documentElement.childNodes[1];
alert(oNode.xml);
function XmlDom() {
if (window.ActiveXObject) {//IE
var arrSignatures = ["MSXML2.DOMDocument.5.0", "MSXML2.DOMDocument.4.0",
"MSXML2.DOMDocument.3.0", "MSXML2.DOMDocument", "Microsoft.XmlDom"];
for (var i = 0; i < arrSignatures.length; i++) {
try {
var oXmlDom = new ActiveXObject(arrSignatures[i]);
return oXmlDom;
}
catch (oError) {
//ignore
}
}
throw new Error("MSXML is not installed on your system.");
} else if (document.implementation && document.implementation.createDocument) {
var oXmlDom = document.implementation.createDocument("", "", null);
oXmlDom.parseError = {valueOf:function () {
return this.errorCode;
}, toString:function () {
return this.errorCode.toString();
}};
oXmlDom.__initError__();
oXmlDom.addEventListener("load", function () {
this.__checkForErrors__();
this.__changeReadyState__(4);
}, false);
return oXmlDom;
} else {
throw new Error("Your browser doesn't support an XML DOM object.");
}
}
if (isMoz) {
Document.prototype._readyState_ = 0;
Document.prototype.onreadystatechange = null;
Document.prototype.__changeReadyState__ = function (iReadyState) {
this._readyState_ = iReadyState;
if (typeof this.onreadystatechange == "function") {
this.onreadystatechange();
}
};
Document.prototype.__initError__ = function () {
this.parseError.errorCode = 0;
this.parseError.filepos = -1;
this.parseError.line = -1;
this.parseError.linepos = -1;
this.parseError.reason = null;
this.parseError.srcText = null;
this.parseError.url = null;
};
Document.prototype.__checkForErrors__ = function () {
if (this.documentElement.tagName == "parsererror") {
var reError = />([\s\S]*?)Location:([\s\S]*?)Line Number (\d+),Column (\d+):<sourcetext>([\s\S]*?)(?:\-*\^)/;
reError.test(this.xml);
this.parseError.errorCode = -999999;
this.parseError.reason = RegExp.$1;
this.parseError.url = RegExp.$2;
this.parseError.line = parseInt(RegExp.$3);
this.parseError.linepos = parseInt(RegExp.$4);
this.parseError.srcText = RegExp.$5;
}
};
Document.prototype.loadXML = function (sXml) {
this.__initError__();
this.__changeReadyState__(1);
var oParser = new DOMParser();
var oXmlDom = oParser.parseFromString(sXml, "text/xml");
while (this.firstChild) {
this.removeChild(this.firstChild);
}
for (var i = 0; i < oXmlDom.childNodes.length; i++) {
var oNewNode = this.importNode(oXmlDom.childNodes[i], true);
this.appendChild(oNewNode);
}
this.__checkForErrors__();
this.__changeReadyState__(4);
};
Document.prototype.__load__ = Document.prototype.load;
Document.prototype.load = function (sURL) {
this.__initError__();
this.__changeReadyState__(1);
this.__load__(sURL);
};
Document.prototype.getReadyState = function () {
return this._readyState_;
};
Node.prototype.__defineGetter__("xml", function () {
var oSerializer = new XMLSerializer();
return oSerializer.serializeToString(this, "text/xml");
});
}